XC912BC32CFU8 Motorola Semiconductor Products, XC912BC32CFU8 Datasheet - Page 139

• Manufacturer Part Number: XC912BC32CFU8
• Description: M68HC12B Family Data Sheet
• Manufacturer: Motorola Semiconductor Products

11.2.4 PWM Prescale Counter
11.2.5 PWM Scale Register 0
M68HC12B Family — Rev. 8.0
MOTOROLA
Read: Anytime
Write: Only in special mode (SMOD = 1)
PWPRES is a free-running 7-bit counter.
Read: Anytime
Write: Anytime
A write causes the scaler counter PWSCNT0 to load the PWSCAL0 value unless
it is in special mode with DISCAL = 1 in the PWTST register.
PWM channels 0 and 1 can select clock S0 (scaled) as its input clock by setting the
control bit PCLK0 and PCLK1 respectively. Clock S0 is generated by dividing clock
A by the value in the PWSCAL0 register plus one and dividing again by two. When
PWSCAL0 = $FF, clock A is divided by 256 then divided by two to generate
clock S0.
Address: $0043
Address: $0044
Reset:
Reset:
Read:
Read:
Write:
Write:
Bit 7
Bit 7
Bit 7
0
0
0
Figure 11-8. PWM Scale Register 0 (PWSCAL0)
Figure 11-7. PWM Prescale Counter (PWPRES)
Pulse-Width Modulator (PWM)
= Unimplemented
Bit 6
Bit 6
6
0
6
0
Bit 5
Bit 5
5
0
5
0
Bit 4
Bit 4
4
0
4
0
Bit 3
Bit 3
3
0
3
0
Pulse-Width Modulator (PWM)
PWM Register Descriptions
Bit 2
Bit 2
2
0
2
0
Bit 1
Bit 1
1
0
1
0
Data Sheet
Bit 0
Bit 0
Bit 0
Bit 0
0
0
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